“The Bitfinex exchange was the target of a Distributed Denial of Service (DDoS) attack this morning,” Kasper Rasmussen, head of marketing, said in an e-mailed statement. “The exchange was offline for an hour following the DDoS attack; however, the exchange is back online now. The attack only impacted trading operations, and user accounts and their associated funds/account balances were not at risk at any point during the attack.”